Power Electronics
Thyristor is nothing but a

 Amplifier with higher gain.
  Controlled switch.
 Amplifier with large current gain.
 Controlled transistor.

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Power Electronics
An SCR is considered to be a semi controlled device because

 it conducts only during one half cycle of an alternating current wave.
 it can be turned ON only during one half cycle of an AC.
 it can be turned ON but not OFF with a gate pulse.
 it can be turned OFF but not ON with a gate pulse.

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Power Electronics
During gate recovery time

  charge carriers of J2 junction recombined.
 charge carriers of J3 junction is removed.
 charge carriers of J2 junction is swept out.
 charge carrier of J1 junction removed.

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